Non-Destructive Testing (NDT)
Testing services to assess the integrity and condition of materials and components without causing damage.
Non-destructive testing is used to detect defects, discontinuities, and material inconsistencies that may affect product performance or compliance, while maintaining the usability of the tested component.
Testing is performed in accordance with applicable standards and defined inspection procedures, based on material type, component geometry, and intended application.
Typical Applications and Services
Non-destructive testing is commonly used for:
- Weld inspection and verification
- Detection of surface and internal defects
- Inspection of pressure-containing equipment
- Manufacturing quality control
- In-service inspection and maintenance
Typical products include:
Welded assemblies
Metal enclosures
Structural components
Pressure vessels and piping
Mechanical parts
Safety-critical equipment
Non-destructive testing services include:
- Visual testing (VT)
- Penetrant testing (PT)
- Magnetic particle testing (MT)
- Ultrasonic testing (UT)
- Radiographic testing (RT) (where applicable)
- Thickness measurement
Testing supports certification, inspection, and quality assurance activities.
NON-Destructive Testing Process
STEP 1. Scope Definition and Method Selection
Review of component, material, and inspection objectives to define applicable NDT methods and acceptance criteria.
STEP 2. Inspection Planning and Preparation
Confirmation of inspection scope, access conditions, surface preparation, and required documentation.
STEP 3. Execution of NDT Inspection
Performance of inspections using selected methods, with evaluation of findings against defined acceptance criteria.
STEP 4. Reporting and Technical Evaluation
Preparation of structured inspection reports including findings, locations, and conclusions suitable for certification, quality control, or project documentation.
WHY DANEM TEST & CERTIFICATE
- Global Expertise
International team to support testing in every region - Independent Approach
Transparent and impartial testing and results audit - Structured Testing process
Clear project planning from assessment through approval - In-house laboratories
Our own laboratory in Latvia and wide range of partner capacity
FAQ
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Which non-destructive testing (NDT) method should be used for a product or welds?
The appropriate non-destructive testing (NDT) method depends on the material type, weld geometry, manufacturing process, and the type of defects that need to be detected in accordance with applicable standards.
For welded structures, common methods include visual testing (VT) as a basic inspection, followed by penetrant testing (PT) for surface-breaking defects, magnetic particle testing (MT) for ferromagnetic materials, ultrasonic testing (UT) for internal defects, and radiographic testing (RT) for volumetric inspection of weld integrity.
Each method has specific advantages and limitations. For example, UT is effective for detecting internal flaws in thicker materials, while PT and MT are suitable for identifying surface or near-surface discontinuities.
What types of products typically require non-destructive testing?
Non-destructive testing is commonly applied to electrical equipment, welded structures, pressure equipment, explosion-protected devices, cables, mechanical assemblies, and safety-critical industrial components.
It is widely used across ATEX, IECEx, PED, EMC, LVD, PPE, and other conformity assessment frameworks.
Can non-destructive testing (NDT) be performed on finished products without disassembly?
Yes. In many cases, non-destructive testing (NDT) can be performed on finished products without disassembly, provided that the inspection method is suitable for the product design and accessible test areas.
Methods such as visual testing (VT), surface inspection techniques (PT or MT), and certain volumetric methods like ultrasonic testing (UT) or radiographic testing (RT) can often be applied to assembled equipment. The feasibility depends on factors such as material type, geometry, wall thickness, and accessibility of critical areas.
However, some inspection requirements may still necessitate partial disassembly to ensure reliable access to critical joints or internal structures. The applicable standards and conformity assessment requirements determine the acceptable level of inspection without disassembly.
How many samples are needed for non-destructive testing?
The number of samples for NDT depends on the inspection method, product complexity, and applicable standards. Since the product is not damaged, fewer samples may be sufficient compared to destructive testing.
However, multiple samples may still be required for statistical validation or when different variants need to be assessed.
How are non-destructive testing (NDT) results documented for certification or project acceptance?
Non-destructive testing (NDT) results are documented in structured inspection reports that provide objective evidence of compliance with applicable standards and project requirements.
Typical documentation includes identification of the tested component, test method used (e.g. VT, PT, MT, UT, RT), inspection procedures, equipment details, test conditions, and the qualifications of the personnel performing the inspection. The report also includes detailed findings, such as detected indications, defect characterization, acceptance criteria, and final test conclusions.
Where required by applicable standards or conformity assessment procedures, NDT reports may form part of the technical documentation or quality records submitted for certification or project approval. Proper traceability and consistency of documentation are essential to demonstrate compliance and ensure acceptance by Notified Bodies or project stakeholders.